Give this a try. Run the CO2 to an airstone directly under the XP3 intake. It's probably the easiest ways of doing it. Also, if there's enough bubbles coming out, you can set a powerhead next to the XP3 intake, and set the airstone so half the bubbles go to the XP3 and the other half to the powerhead. That's how I have mine currently, and I get great CO2 levels. Yes, I am pressurized, but I'm only running just over 1 bubble per second. Should be able to get that with the DIY. And I'm getting excellent growth, and very minimal algae isues.